Making a move?

I have a male friend, about 8 years older than I am, who I've become very attracted to over the past 8 months or so, mostly sexually.

A couple things first: I have been celibate for many years, and I normally don't "catch feelings" of any sort towards anyone, so this is incredibly hard for me. It's not that I've never, but just usually don't. I have many guy friends who are, and will only ever be, just that. Please don't mock this. This is difficult.

We've known each other for a couple of years, and most of the time when I invite him out to group activities (pretty much the only activities I do because I enjoy my alone time), he will go. The only times he hasn't were when family was visiting, or he was sick. We've spent a few occasions alone, talking, and I feel like there's something there, and my gut says there is, but am terrified I'm just hormonal or something.

About him: He's only had one or two serious relationships, isn't into social media/texting, any of that, though he will text back if I initiate. He seems kind of repressed, as well; lives in his own bubble, isn't touchy feely, isn't very good at showing his cards. He obliges almost everything I've ever asked of him without asking anything in return, however. He's generally friendly, though, but a couple of friends have noticed he will almost always follow my lead. Last time we were out, it ended up being just him and I. He was acting nervous, kept fixing his hair, and made some self-depricating comments to which I basically replied "not true". I've heard it before here and there.

I can't figure out if he is actually interested at all, and just as awkward/clueless/terrified as I am due to his own history, or what. I want to say/do something to make it clear, besides the ambiguous arm touching, but I also clearly suck when it comes to this sort of thing, and simply not very forward when it comes down to it.

Appreciate any insight into this.